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<div class="subTitle">org.apache.commons.math3.ode</div>
<h2 title="Class MultistepIntegrator" class="title">Class MultistepIntegrator</h2>
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<li><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
<li>
<ul class="inheritance">
<li><a href="../../../../../org/apache/commons/math3/ode/AbstractIntegrator.html" title="class in org.apache.commons.math3.ode">org.apache.commons.math3.ode.AbstractIntegrator</a></li>
<li>
<ul class="inheritance">
<li><a href="../../../../../org/apache/commons/math3/ode/nonstiff/AdaptiveStepsizeIntegrator.html" title="class in org.apache.commons.math3.ode.nonstiff">org.apache.commons.math3.ode.nonstiff.AdaptiveStepsizeIntegrator</a></li>
<li>
<ul class="inheritance">
<li>org.apache.commons.math3.ode.MultistepIntegrator</li>
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<dl>
<dt>All Implemented Interfaces:</dt>
<dd><a href="../../../../../org/apache/commons/math3/ode/FirstOrderIntegrator.html" title="interface in org.apache.commons.math3.ode">FirstOrderIntegrator</a>, <a href="../../../../../org/apache/commons/math3/ode/ODEIntegrator.html" title="interface in org.apache.commons.math3.ode">ODEIntegrator</a></dd>
</dl>
<dl>
<dt>Direct Known Subclasses:</dt>
<dd><a href="../../../../../org/apache/commons/math3/ode/nonstiff/AdamsIntegrator.html" title="class in org.apache.commons.math3.ode.nonstiff">AdamsIntegrator</a></dd>
</dl>
<hr>
<br>
<pre>public abstract class <span class="strong">MultistepIntegrator</span>
extends <a href="../../../../../org/apache/commons/math3/ode/nonstiff/AdaptiveStepsizeIntegrator.html" title="class in org.apache.commons.math3.ode.nonstiff">AdaptiveStepsizeIntegrator</a></pre>
<div class="block">This class is the base class for multistep integrators for Ordinary
 Differential Equations.
 <p>We define scaled derivatives s<sub>i</sub>(n) at step n as:
 <pre>
 s<sub>1</sub>(n) = h y'<sub>n</sub> for first derivative
 s<sub>2</sub>(n) = h<sup>2</sup>/2 y''<sub>n</sub> for second derivative
 s<sub>3</sub>(n) = h<sup>3</sup>/6 y'''<sub>n</sub> for third derivative
 ...
 s<sub>k</sub>(n) = h<sup>k</sup>/k! y<sup>(k)</sup><sub>n</sub> for k<sup>th</sup> derivative
 </pre></p>
 <p>Rather than storing several previous steps separately, this implementation uses
 the Nordsieck vector with higher degrees scaled derivatives all taken at the same
 step (y<sub>n</sub>, s<sub>1</sub>(n) and r<sub>n</sub>) where r<sub>n</sub> is defined as:
 <pre>
 r<sub>n</sub> = [ s<sub>2</sub>(n), s<sub>3</sub>(n) ... s<sub>k</sub>(n) ]<sup>T</sup>
 </pre>
 (we omit the k index in the notation for clarity)</p>
 <p>
 Multistep integrators with Nordsieck representation are highly sensitive to
 large step changes because when the step is multiplied by factor a, the
 k<sup>th</sup> component of the Nordsieck vector is multiplied by a<sup>k</sup>
 and the last components are the least accurate ones. The default max growth
 factor is therefore set to a quite low value: 2<sup>1/order</sup>.
 </p></div>
<dl><dt><span class="strong">Since:</span></dt>
  <dd>2.0</dd>
<dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../org/apache/commons/math3/ode/nonstiff/AdamsBashforthIntegrator.html" title="class in org.apache.commons.math3.ode.nonstiff"><code>AdamsBashforthIntegrator</code></a>, 
<a href="../../../../../org/apache/commons/math3/ode/nonstiff/AdamsMoultonIntegrator.html" title="class in org.apache.commons.math3.ode.nonstiff"><code>AdamsMoultonIntegrator</code></a></dd></dl>
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<td class="colFirst"><code>static interface&nbsp;</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/ode/MultistepIntegrator.NordsieckTransformer.html" title="interface in org.apache.commons.math3.ode">MultistepIntegrator.NordsieckTransformer</a></strong></code>
<div class="block"><strong>Deprecated.</strong>&nbsp;
<div class="block"><i>as of 3.6 this unused interface is deprecated</i></div>
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<h3>Field Summary</h3>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<td class="colFirst"><code>protected <a href="../../../../../org/apache/commons/math3/linear/Array2DRowRealMatrix.html" title="class in org.apache.commons.math3.linear">Array2DRowRealMatrix</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/ode/MultistepIntegrator.html#nordsieck">nordsieck</a></strong></code>
<div class="block">Nordsieck matrix of the higher scaled derivatives.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected double[]</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/ode/MultistepIntegrator.html#scaled">scaled</a></strong></code>
<div class="block">First scaled derivative (h y').</div>
</td>
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<h3>Fields inherited from class&nbsp;org.apache.commons.math3.ode.nonstiff.<a href="../../../../../org/apache/commons/math3/ode/nonstiff/AdaptiveStepsizeIntegrator.html" title="class in org.apache.commons.math3.ode.nonstiff">AdaptiveStepsizeIntegrator</a></h3>
<code><a href="../../../../../org/apache/commons/math3/ode/nonstiff/AdaptiveStepsizeIntegrator.html#mainSetDimension">mainSetDimension</a>, <a href="../../../../../org/apache/commons/math3/ode/nonstiff/AdaptiveStepsizeIntegrator.html#scalAbsoluteTolerance">scalAbsoluteTolerance</a>, <a href="../../../../../org/apache/commons/math3/ode/nonstiff/AdaptiveStepsizeIntegrator.html#scalRelativeTolerance">scalRelativeTolerance</a>, <a href="../../../../../org/apache/commons/math3/ode/nonstiff/AdaptiveStepsizeIntegrator.html#vecAbsoluteTolerance">vecAbsoluteTolerance</a>, <a href="../../../../../org/apache/commons/math3/ode/nonstiff/AdaptiveStepsizeIntegrator.html#vecRelativeTolerance">vecRelativeTolerance</a></code></li>
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<h3>Fields inherited from class&nbsp;org.apache.commons.math3.ode.<a href="../../../../../org/apache/commons/math3/ode/AbstractIntegrator.html" title="class in org.apache.commons.math3.ode">AbstractIntegrator</a></h3>
<code><a href="../../../../../org/apache/commons/math3/ode/AbstractIntegrator.html#isLastStep">isLastStep</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractIntegrator.html#resetOccurred">resetOccurred</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractIntegrator.html#stepHandlers">stepHandlers</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractIntegrator.html#stepSize">stepSize</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractIntegrator.html#stepStart">stepStart</a></code></li>
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<th class="colLast" scope="col">Constructor and Description</th>
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<tr class="altColor">
<td class="colFirst"><code>protected </code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/ode/MultistepIntegrator.html#MultistepIntegrator(java.lang.String,%20int,%20int,%20double,%20double,%20double[],%20double[])">MultistepIntegrator</a></strong>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;name,
                   int&nbsp;nSteps,
                   int&nbsp;order,
                   double&nbsp;minStep,
                   double&nbsp;maxStep,
                   double[]&nbsp;vecAbsoluteTolerance,
                   double[]&nbsp;vecRelativeTolerance)</code>
<div class="block">Build a multistep integrator with the given stepsize bounds.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected </code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/ode/MultistepIntegrator.html#MultistepIntegrator(java.lang.String,%20int,%20int,%20double,%20double,%20double,%20double)">MultistepIntegrator</a></strong>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;name,
                   int&nbsp;nSteps,
                   int&nbsp;order,
                   double&nbsp;minStep,
                   double&nbsp;maxStep,
                   double&nbsp;scalAbsoluteTolerance,
                   double&nbsp;scalRelativeTolerance)</code>
<div class="block">Build a multistep integrator with the given stepsize bounds.</div>
</td>
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<h3>Method Summary</h3>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<td class="colFirst"><code>protected double</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/ode/MultistepIntegrator.html#computeStepGrowShrinkFactor(double)">computeStepGrowShrinkFactor</a></strong>(double&nbsp;error)</code>
<div class="block">Compute step grow/shrink factor according to normalized error.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/ode/MultistepIntegrator.html#getMaxGrowth()">getMaxGrowth</a></strong>()</code>
<div class="block">Get the maximal growth factor for stepsize control.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/ode/MultistepIntegrator.html#getMinReduction()">getMinReduction</a></strong>()</code>
<div class="block">Get the minimal reduction factor for stepsize control.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/ode/MultistepIntegrator.html#getNSteps()">getNSteps</a></strong>()</code>
<div class="block">Get the number of steps of the multistep method (excluding the one being computed).</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/ode/MultistepIntegrator.html#getSafety()">getSafety</a></strong>()</code>
<div class="block">Get the safety factor for stepsize control.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/commons/math3/ode/ODEIntegrator.html" title="interface in org.apache.commons.math3.ode">ODEIntegrator</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/ode/MultistepIntegrator.html#getStarterIntegrator()">getStarterIntegrator</a></strong>()</code>
<div class="block">Get the starter integrator.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected abstract <a href="../../../../../org/apache/commons/math3/linear/Array2DRowRealMatrix.html" title="class in org.apache.commons.math3.linear">Array2DRowRealMatrix</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/ode/MultistepIntegrator.html#initializeHighOrderDerivatives(double,%20double[],%20double[][],%20double[][])">initializeHighOrderDerivatives</a></strong>(double&nbsp;h,
                              double[]&nbsp;t,
                              double[][]&nbsp;y,
                              double[][]&nbsp;yDot)</code>
<div class="block">Initialize the high order scaled derivatives at step start.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/ode/MultistepIntegrator.html#setMaxGrowth(double)">setMaxGrowth</a></strong>(double&nbsp;maxGrowth)</code>
<div class="block">Set the maximal growth factor for stepsize control.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/ode/MultistepIntegrator.html#setMinReduction(double)">setMinReduction</a></strong>(double&nbsp;minReduction)</code>
<div class="block">Set the minimal reduction factor for stepsize control.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/ode/MultistepIntegrator.html#setSafety(double)">setSafety</a></strong>(double&nbsp;safety)</code>
<div class="block">Set the safety factor for stepsize control.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/ode/MultistepIntegrator.html#setStarterIntegrator(org.apache.commons.math3.ode.FirstOrderIntegrator)">setStarterIntegrator</a></strong>(<a href="../../../../../org/apache/commons/math3/ode/FirstOrderIntegrator.html" title="interface in org.apache.commons.math3.ode">FirstOrderIntegrator</a>&nbsp;starterIntegrator)</code>
<div class="block">Set the starter integrator.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/ode/MultistepIntegrator.html#start(double,%20double[],%20double)">start</a></strong>(double&nbsp;t0,
     double[]&nbsp;y0,
     double&nbsp;t)</code>
<div class="block">Start the integration.</div>
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<h3>Methods inherited from class&nbsp;org.apache.commons.math3.ode.nonstiff.<a href="../../../../../org/apache/commons/math3/ode/nonstiff/AdaptiveStepsizeIntegrator.html" title="class in org.apache.commons.math3.ode.nonstiff">AdaptiveStepsizeIntegrator</a></h3>
<code><a href="../../../../../org/apache/commons/math3/ode/nonstiff/AdaptiveStepsizeIntegrator.html#filterStep(double,%20boolean,%20boolean)">filterStep</a>, <a href="../../../../../org/apache/commons/math3/ode/nonstiff/AdaptiveStepsizeIntegrator.html#getCurrentStepStart()">getCurrentStepStart</a>, <a href="../../../../../org/apache/commons/math3/ode/nonstiff/AdaptiveStepsizeIntegrator.html#getMaxStep()">getMaxStep</a>, <a href="../../../../../org/apache/commons/math3/ode/nonstiff/AdaptiveStepsizeIntegrator.html#getMinStep()">getMinStep</a>, <a href="../../../../../org/apache/commons/math3/ode/nonstiff/AdaptiveStepsizeIntegrator.html#initializeStep(boolean,%20int,%20double[],%20double,%20double[],%20double[],%20double[],%20double[])">initializeStep</a>, <a href="../../../../../org/apache/commons/math3/ode/nonstiff/AdaptiveStepsizeIntegrator.html#integrate(org.apache.commons.math3.ode.ExpandableStatefulODE,%20double)">integrate</a>, <a href="../../../../../org/apache/commons/math3/ode/nonstiff/AdaptiveStepsizeIntegrator.html#resetInternalState()">resetInternalState</a>, <a href="../../../../../org/apache/commons/math3/ode/nonstiff/AdaptiveStepsizeIntegrator.html#sanityChecks(org.apache.commons.math3.ode.ExpandableStatefulODE,%20double)">sanityChecks</a>, <a href="../../../../../org/apache/commons/math3/ode/nonstiff/AdaptiveStepsizeIntegrator.html#setInitialStepSize(double)">setInitialStepSize</a>, <a href="../../../../../org/apache/commons/math3/ode/nonstiff/AdaptiveStepsizeIntegrator.html#setStepSizeControl(double,%20double,%20double[],%20double[])">setStepSizeControl</a>, <a href="../../../../../org/apache/commons/math3/ode/nonstiff/AdaptiveStepsizeIntegrator.html#setStepSizeControl(double,%20double,%20double,%20double)">setStepSizeControl</a></code></li>
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<h3>Methods inherited from class&nbsp;org.apache.commons.math3.ode.<a href="../../../../../org/apache/commons/math3/ode/AbstractIntegrator.html" title="class in org.apache.commons.math3.ode">AbstractIntegrator</a></h3>
<code><a href="../../../../../org/apache/commons/math3/ode/AbstractIntegrator.html#acceptStep(org.apache.commons.math3.ode.sampling.AbstractStepInterpolator,%20double[],%20double[],%20double)">acceptStep</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractIntegrator.html#addEventHandler(org.apache.commons.math3.ode.events.EventHandler,%20double,%20double,%20int)">addEventHandler</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractIntegrator.html#addEventHandler(org.apache.commons.math3.ode.events.EventHandler,%20double,%20double,%20int,%20org.apache.commons.math3.analysis.solvers.UnivariateSolver)">addEventHandler</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractIntegrator.html#addStepHandler(org.apache.commons.math3.ode.sampling.StepHandler)">addStepHandler</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractIntegrator.html#clearEventHandlers()">clearEventHandlers</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractIntegrator.html#clearStepHandlers()">clearStepHandlers</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractIntegrator.html#computeDerivatives(double,%20double[],%20double[])">computeDerivatives</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractIntegrator.html#getCounter()">getCounter</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractIntegrator.html#getCurrentSignedStepsize()">getCurrentSignedStepsize</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractIntegrator.html#getEvaluations()">getEvaluations</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractIntegrator.html#getEvaluationsCounter()">getEvaluationsCounter</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractIntegrator.html#getEventHandlers()">getEventHandlers</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractIntegrator.html#getExpandable()">getExpandable</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractIntegrator.html#getMaxEvaluations()">getMaxEvaluations</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractIntegrator.html#getName()">getName</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractIntegrator.html#getStepHandlers()">getStepHandlers</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractIntegrator.html#initIntegration(double,%20double[],%20double)">initIntegration</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractIntegrator.html#integrate(org.apache.commons.math3.ode.FirstOrderDifferentialEquations,%20double,%20double[],%20double,%20double[])">integrate</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractIntegrator.html#setEquations(org.apache.commons.math3.ode.ExpandableStatefulODE)">setEquations</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractIntegrator.html#setMaxEvaluations(int)">setMaxEvaluations</a>, <a href="../../../../../org/apache/commons/math3/ode/AbstractIntegrator.html#setStateInitialized(boolean)">setStateInitialized</a></code></li>
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<pre>protected&nbsp;double[] scaled</pre>
<div class="block">First scaled derivative (h y').</div>
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<h4>nordsieck</h4>
<pre>protected&nbsp;<a href="../../../../../org/apache/commons/math3/linear/Array2DRowRealMatrix.html" title="class in org.apache.commons.math3.linear">Array2DRowRealMatrix</a> nordsieck</pre>
<div class="block">Nordsieck matrix of the higher scaled derivatives.
 <p>(h<sup>2</sup>/2 y'', h<sup>3</sup>/6 y''' ..., h<sup>k</sup>/k! y<sup>(k)</sup>)</p></div>
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<h4>MultistepIntegrator</h4>
<pre>protected&nbsp;MultistepIntegrator(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;name,
                   int&nbsp;nSteps,
                   int&nbsp;order,
                   double&nbsp;minStep,
                   double&nbsp;maxStep,
                   double&nbsp;scalAbsoluteTolerance,
                   double&nbsp;scalRelativeTolerance)
                       throws <a href="../../../../../org/apache/commons/math3/exception/NumberIsTooSmallException.html" title="class in org.apache.commons.math3.exception">NumberIsTooSmallException</a></pre>
<div class="block">Build a multistep integrator with the given stepsize bounds.
 <p>The default starter integrator is set to the <a href="../../../../../org/apache/commons/math3/ode/nonstiff/DormandPrince853Integrator.html" title="class in org.apache.commons.math3.ode.nonstiff"><code>Dormand-Prince 8(5,3)</code></a> integrator with
 some defaults settings.</p>
 <p>
 The default max growth factor is set to a quite low value: 2<sup>1/order</sup>.
 </p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>name</code> - name of the method</dd><dd><code>nSteps</code> - number of steps of the multistep method
 (excluding the one being computed)</dd><dd><code>order</code> - order of the method</dd><dd><code>minStep</code> - minimal step (must be positive even for backward
 integration), the last step can be smaller than this</dd><dd><code>maxStep</code> - maximal step (must be positive even for backward
 integration)</dd><dd><code>scalAbsoluteTolerance</code> - allowed absolute error</dd><dd><code>scalRelativeTolerance</code> - allowed relative error</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/NumberIsTooSmallException.html" title="class in org.apache.commons.math3.exception">NumberIsTooSmallException</a></code> - if number of steps is smaller than 2</dd></dl>
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<pre>protected&nbsp;MultistepIntegrator(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;name,
                   int&nbsp;nSteps,
                   int&nbsp;order,
                   double&nbsp;minStep,
                   double&nbsp;maxStep,
                   double[]&nbsp;vecAbsoluteTolerance,
                   double[]&nbsp;vecRelativeTolerance)</pre>
<div class="block">Build a multistep integrator with the given stepsize bounds.
 <p>The default starter integrator is set to the <a href="../../../../../org/apache/commons/math3/ode/nonstiff/DormandPrince853Integrator.html" title="class in org.apache.commons.math3.ode.nonstiff"><code>Dormand-Prince 8(5,3)</code></a> integrator with
 some defaults settings.</p>
 <p>
 The default max growth factor is set to a quite low value: 2<sup>1/order</sup>.
 </p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>name</code> - name of the method</dd><dd><code>nSteps</code> - number of steps of the multistep method
 (excluding the one being computed)</dd><dd><code>order</code> - order of the method</dd><dd><code>minStep</code> - minimal step (must be positive even for backward
 integration), the last step can be smaller than this</dd><dd><code>maxStep</code> - maximal step (must be positive even for backward
 integration)</dd><dd><code>vecAbsoluteTolerance</code> - allowed absolute error</dd><dd><code>vecRelativeTolerance</code> - allowed relative error</dd></dl>
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<pre>public&nbsp;<a href="../../../../../org/apache/commons/math3/ode/ODEIntegrator.html" title="interface in org.apache.commons.math3.ode">ODEIntegrator</a>&nbsp;getStarterIntegrator()</pre>
<div class="block">Get the starter integrator.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>starter integrator</dd></dl>
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<pre>public&nbsp;void&nbsp;setStarterIntegrator(<a href="../../../../../org/apache/commons/math3/ode/FirstOrderIntegrator.html" title="interface in org.apache.commons.math3.ode">FirstOrderIntegrator</a>&nbsp;starterIntegrator)</pre>
<div class="block">Set the starter integrator.
 <p>The various step and event handlers for this starter integrator
 will be managed automatically by the multi-step integrator. Any
 user configuration for these elements will be cleared before use.</p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>starterIntegrator</code> - starter integrator</dd></dl>
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<pre>protected&nbsp;void&nbsp;start(double&nbsp;t0,
         double[]&nbsp;y0,
         double&nbsp;t)
              throws <a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a>,
                     <a href="../../../../../org/apache/commons/math3/exception/NumberIsTooSmallException.html" title="class in org.apache.commons.math3.exception">NumberIsTooSmallException</a>,
                     <a href="../../../../../org/apache/commons/math3/exception/MaxCountExceededException.html" title="class in org.apache.commons.math3.exception">MaxCountExceededException</a>,
                     <a href="../../../../../org/apache/commons/math3/exception/NoBracketingException.html" title="class in org.apache.commons.math3.exception">NoBracketingException</a></pre>
<div class="block">Start the integration.
 <p>This method computes one step using the underlying starter integrator,
 and initializes the Nordsieck vector at step start. The starter integrator
 purpose is only to establish initial conditions, it does not really change
 time by itself. The top level multistep integrator remains in charge of
 handling time propagation and events handling as it will starts its own
 computation right from the beginning. In a sense, the starter integrator
 can be seen as a dummy one and so it will never trigger any user event nor
 call any user step handler.</p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>t0</code> - initial time</dd><dd><code>y0</code> - initial value of the state vector at t0</dd><dd><code>t</code> - target time for the integration
 (can be set to a value smaller than <code>t0</code> for backward integration)</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a></code> - if arrays dimension do not match equations settings</dd>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/NumberIsTooSmallException.html" title="class in org.apache.commons.math3.exception">NumberIsTooSmallException</a></code> - if integration step is too small</dd>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/MaxCountExceededException.html" title="class in org.apache.commons.math3.exception">MaxCountExceededException</a></code> - if the number of functions evaluations is exceeded</dd>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/NoBracketingException.html" title="class in org.apache.commons.math3.exception">NoBracketingException</a></code> - if the location of an event cannot be bracketed</dd></dl>
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<pre>protected abstract&nbsp;<a href="../../../../../org/apache/commons/math3/linear/Array2DRowRealMatrix.html" title="class in org.apache.commons.math3.linear">Array2DRowRealMatrix</a>&nbsp;initializeHighOrderDerivatives(double&nbsp;h,
                                                  double[]&nbsp;t,
                                                  double[][]&nbsp;y,
                                                  double[][]&nbsp;yDot)</pre>
<div class="block">Initialize the high order scaled derivatives at step start.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>h</code> - step size to use for scaling</dd><dd><code>t</code> - first steps times</dd><dd><code>y</code> - first steps states</dd><dd><code>yDot</code> - first steps derivatives</dd>
<dt><span class="strong">Returns:</span></dt><dd>Nordieck vector at first step (h<sup>2</sup>/2 y''<sub>n</sub>,
 h<sup>3</sup>/6 y'''<sub>n</sub> ... h<sup>k</sup>/k! y<sup>(k)</sup><sub>n</sub>)</dd></dl>
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<pre>public&nbsp;double&nbsp;getMinReduction()</pre>
<div class="block">Get the minimal reduction factor for stepsize control.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>minimal reduction factor</dd></dl>
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<pre>public&nbsp;void&nbsp;setMinReduction(double&nbsp;minReduction)</pre>
<div class="block">Set the minimal reduction factor for stepsize control.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>minReduction</code> - minimal reduction factor</dd></dl>
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<pre>public&nbsp;double&nbsp;getMaxGrowth()</pre>
<div class="block">Get the maximal growth factor for stepsize control.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>maximal growth factor</dd></dl>
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<pre>public&nbsp;void&nbsp;setMaxGrowth(double&nbsp;maxGrowth)</pre>
<div class="block">Set the maximal growth factor for stepsize control.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>maxGrowth</code> - maximal growth factor</dd></dl>
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<pre>public&nbsp;double&nbsp;getSafety()</pre>
<div class="block">Get the safety factor for stepsize control.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>safety factor</dd></dl>
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<pre>public&nbsp;void&nbsp;setSafety(double&nbsp;safety)</pre>
<div class="block">Set the safety factor for stepsize control.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>safety</code> - safety factor</dd></dl>
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<pre>public&nbsp;int&nbsp;getNSteps()</pre>
<div class="block">Get the number of steps of the multistep method (excluding the one being computed).</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>number of steps of the multistep method (excluding the one being computed)</dd></dl>
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<pre>protected&nbsp;double&nbsp;computeStepGrowShrinkFactor(double&nbsp;error)</pre>
<div class="block">Compute step grow/shrink factor according to normalized error.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>error</code> - normalized error of the current step</dd>
<dt><span class="strong">Returns:</span></dt><dd>grow/shrink factor for next step</dd></dl>
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